CN3125

{
  "schema_version": 1,
  "type": "component",
  "slug": "cn3125",
  "title": "CN3125",
  "brief": "ShangHai Consonance Elec Battery Management, ESOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "cn3125"
  ],
  "component": {
    "mpn": "CN3125",
    "manufacturer": "ShangHai Consonance Elec",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "PMIC",
    "subcategory": "Battery Management",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/bbc335548944dc2a0f0c95095e91329d.pdf",
    "parts": {
      "symbol": "cn3125.kicad_sym",
      "footprint": "cn3125.kicad_mod",
      "model_3d": "cn3125-etched.glb",
      "model_3d_plain": "cn3125.glb",
      "model_3d_step": "cn3125-etched.step",
      "model_3d_step_plain": "cn3125.step",
      "lbr": "cn3125.lbr"
    },
    "distributor_links": {
      "lcsc": "C559037"
    },
    "pins": [
      {
        "number": "1",
        "name": "CE",
        "type": "input",
        "description": "Chip Enable. A logic high enables normal operation; pulling CE low puts the CN3125 into disable mode and the whole device is turned off. TTL/CMOS compatible (VCEH >= 2.2V, VCEL <= 0.7V)."
      },
      {
        "number": "2",
        "name": "ISET",
        "type": "passive",
        "description": "Constant charge current setting and charge current monitor pin. Charge current is programmed by a resistor R_ISET from this pin to GND; V_ISET is regulated to 1.205V in constant-current mode. Charge current: ICH = (V_ISET / R_ISET) x 986."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Ground terminal."
      },
      {
        "number": "4",
        "name": "VIN",
        "type": "power_in",
        "description": "Positive input supply voltage (2.7V to 6V, absolute max 6.5V). Powers internal circuitry and the on-chip P-channel power MOSFET. When VIN drops within 10mV of the TOP pin voltage, the part enters low-power sleep mode (TOP/MID current < 3uA)."
      },
      {
        "number": "5",
        "name": "TOP",
        "type": "power_out",
        "description": "Positive terminal connection to the top supercapacitor. Charge current is delivered from this pin. For 2-cell configuration, connect to the positive terminal of the top supercap; for single-cell, tie the single supercap between TOP and GND. Continuous short-circuit tolerant."
      },
      {
        "number": "6",
        "name": "MID",
        "type": "bidirectional",
        "description": "Middle connection of the 2 supercapacitors. The negative terminal of the top supercap and the positive terminal of the bottom supercap connect here. Sources/sinks active cell-balancing shunt current (I_SHTOP up to ~55mA typ, I_SHBOT up to ~50mA typ). Continuous short-circuit tolerant."
      },
      {
        "number": "7",
        "name": "PG",
        "type": "output",
        "description": "Open-drain Power Good output (active-low, /PG). Pulls low when the supercapacitor voltage rises above ~94.1% of the final regulated voltage set at FB, and returns to high-impedance when it falls below ~90%. High-impedance when disabled or in sleep mode. Sink current up to 10mA at V_PG = 0.3V."
      },
      {
        "number": "8",
        "name": "FB",
        "type": "input",
        "description": "Supercapacitor voltage feedback pin. The constant-voltage regulation point is set by an external resistor divider tied from TOP (or MID for single-cell) to FB to GND; internal reference V_REGFB = 1.205V (1.193-1.217V). Leakage +/-100nA max."
      },
      {
        "number": "9",
        "name": "EP",
        "type": "power_in",
        "description": "Exposed thermal pad on the underside of the eSOP-8 package. Must be soldered to the GND plane for proper electrical grounding and heat dissipation."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/bbc335548944dc2a0f0c95095e91329d.pdf",
        "pages": 11,
        "sha256": "01642d3ae17a657f",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm@sha256:5848244c5e72002e",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "cn3125.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "f1718a42c5ea007e8e2dd672ac39a1bb358ee4849bd53c42e21ce83e0e5df7a9",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cn3125-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "bd1f0601da4bbffe5284e3fddc4c785ca2f7e44c58bbe15f75ff3637c811488b",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ShangHai Consonance Elec",
      "Package": "ESOP-8",
      "Category": "PMIC",
      "Pins": "9"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "cn3125"
  ],
  "discovery_pitch": "CN3125 (ShangHai Consonance Elec) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "cn3125.kicad_sym",
    "cn3125.kicad_mod",
    "cn3125.glb",
    "cn3125.step",
    "cn3125-etched.step",
    "cn3125.lbr",
    "docs/hero.png",
    "docs/cn3125-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "variants": [
    {
      "mpn": "CN3125",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-24T19:20:22.254Z"
}